I need some christians to talk to i get bored

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3